如何使用作为参数传递给方法的类类型来定义局部变量

Question

I have a cache that compartmentalizes by namespace. I would like to use class type to determine which cache to use. The following method gives an idea of what I want to accomplish. I use the word cache loosely. I am more interested in correcting my design pattern so it works.

public static DObject getFromCache(String key,Class<T extends DObject> type) {
  MyCache cache = getWithName(type.getName());
  // ......
  type.class value = (type.class) cache.get(key);
  // ......
}

where DObject is a naming interface. How do I fix so that type.class value = (type.class) cache.get(key) works well? I know this would be a joke for Scala but I want to use Java.

Answer 1

T value = type.cast(cache.get(key));

（您可以很好地声明T类型的变量，但是类型擦除意味着您不能转换为T。幸运的是， Class#cast可以为您提供帮助。）